Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / xsp / System / Web / Util / SystemInfo.cs / 1 / SystemInfo.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Util { internal static class SystemInfo { static int _trueNumberOfProcessors; static internal int GetNumProcessCPUs() { if (_trueNumberOfProcessors == 0) { UnsafeNativeMethods.SYSTEM_INFO si; UnsafeNativeMethods.GetSystemInfo(out si); if (si.dwNumberOfProcessors == 1) { _trueNumberOfProcessors = 1; } else { // KERNEL32.DLL:GetCurrentProcess() always returns -1 under NT // Note: not really a handle (no need to CloseHandle()) IntPtr processHandle = UnsafeNativeMethods.INVALID_HANDLE_VALUE; IntPtr processAffinityMask; IntPtr systemAffinityMask; int returnCode = UnsafeNativeMethods.GetProcessAffinityMask( processHandle, out processAffinityMask, out systemAffinityMask); if (returnCode == 0) { _trueNumberOfProcessors = 1; } else { // if cpu affinity is set to a single processor busy waiting is a waste of time int numProcessors = 0; if (IntPtr.Size == 4) { uint mask = (uint) processAffinityMask; for (; mask != 0; mask >>= 1) { if ((mask & 1) == 1) { ++numProcessors; } } } else { ulong mask = (ulong) processAffinityMask; for (; mask != 0; mask >>= 1) { if ((mask & 1) == 1) { ++numProcessors; } } } _trueNumberOfProcessors = numProcessors; } } } Debug.Assert(_trueNumberOfProcessors > 0); return _trueNumberOfProcessors; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.Util { internal static class SystemInfo { static int _trueNumberOfProcessors; static internal int GetNumProcessCPUs() { if (_trueNumberOfProcessors == 0) { UnsafeNativeMethods.SYSTEM_INFO si; UnsafeNativeMethods.GetSystemInfo(out si); if (si.dwNumberOfProcessors == 1) { _trueNumberOfProcessors = 1; } else { // KERNEL32.DLL:GetCurrentProcess() always returns -1 under NT // Note: not really a handle (no need to CloseHandle()) IntPtr processHandle = UnsafeNativeMethods.INVALID_HANDLE_VALUE; IntPtr processAffinityMask; IntPtr systemAffinityMask; int returnCode = UnsafeNativeMethods.GetProcessAffinityMask( processHandle, out processAffinityMask, out systemAffinityMask); if (returnCode == 0) { _trueNumberOfProcessors = 1; } else { // if cpu affinity is set to a single processor busy waiting is a waste of time int numProcessors = 0; if (IntPtr.Size == 4) { uint mask = (uint) processAffinityMask; for (; mask != 0; mask >>= 1) { if ((mask & 1) == 1) { ++numProcessors; } } } else { ulong mask = (ulong) processAffinityMask; for (; mask != 0; mask >>= 1) { if ((mask & 1) == 1) { ++numProcessors; } } } _trueNumberOfProcessors = numProcessors; } } } Debug.Assert(_trueNumberOfProcessors > 0); return _trueNumberOfProcessors; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- BamlTreeNode.cs
- PerformanceCounterPermission.cs
- DefaultObjectMappingItemCollection.cs
- DesignerOptions.cs
- DataGridViewCellParsingEventArgs.cs
- ExpressionDumper.cs
- ParameterRefs.cs
- _HeaderInfo.cs
- OleDbEnumerator.cs
- contentDescriptor.cs
- DefaultMemberAttribute.cs
- FilteredDataSetHelper.cs
- ApplicationDirectory.cs
- DependencyPropertyDescriptor.cs
- HGlobalSafeHandle.cs
- FixUp.cs
- Unit.cs
- FrameworkTextComposition.cs
- PackWebRequestFactory.cs
- PolicyLevel.cs
- DynamicRenderer.cs
- EntitySqlQueryBuilder.cs
- DBConnection.cs
- GradientStop.cs
- CacheHelper.cs
- Brush.cs
- ExecutionContext.cs
- UIElementParagraph.cs
- InfoCardAsymmetricCrypto.cs
- StateFinalizationDesigner.cs
- SinglePageViewer.cs
- ContentPresenter.cs
- UserControlDesigner.cs
- XmlSchemaNotation.cs
- NativeMethods.cs
- PrintingPermission.cs
- CopyNodeSetAction.cs
- SoapReflectionImporter.cs
- StringOutput.cs
- MailSettingsSection.cs
- SchemaEntity.cs
- XmlSchemaComplexContentRestriction.cs
- ContainerParaClient.cs
- SequentialActivityDesigner.cs
- SnapLine.cs
- InfoCardArgumentException.cs
- RegularExpressionValidator.cs
- ValueChangedEventManager.cs
- XmlUtf8RawTextWriter.cs
- TypeUnloadedException.cs
- WindowsGrip.cs
- ValidationRuleCollection.cs
- Properties.cs
- PointHitTestParameters.cs
- IdentityHolder.cs
- GlyphRun.cs
- AvTraceDetails.cs
- DataGridAutomationPeer.cs
- ISAPIApplicationHost.cs
- CodeExpressionStatement.cs
- EventManager.cs
- KeyValueConfigurationCollection.cs
- HelpOperationInvoker.cs
- DocumentXmlWriter.cs
- GridViewColumnHeaderAutomationPeer.cs
- CompositeActivityTypeDescriptor.cs
- NamespaceTable.cs
- HeaderCollection.cs
- TrackingProfileManager.cs
- XmlArrayItemAttribute.cs
- DiscoveryClientDocuments.cs
- SolidColorBrush.cs
- EmbeddedMailObjectCollectionEditor.cs
- SpecularMaterial.cs
- TypedElement.cs
- FileUpload.cs
- EncryptedXml.cs
- DrawingGroupDrawingContext.cs
- CornerRadius.cs
- TraceContextRecord.cs
- TransactionProxy.cs
- CallbackValidatorAttribute.cs
- FirstMatchCodeGroup.cs
- WebPartHeaderCloseVerb.cs
- AsymmetricSecurityProtocol.cs
- ManagedFilter.cs
- MouseBinding.cs
- ParseHttpDate.cs
- TextTreeText.cs
- NetworkAddressChange.cs
- Mapping.cs
- OutOfProcStateClientManager.cs
- ProcessManager.cs
- DatePickerDateValidationErrorEventArgs.cs
- parserscommon.cs
- XmlWrappingWriter.cs
- CodeGeneratorOptions.cs
- ConsumerConnectionPoint.cs
- OutputCacheModule.cs
- FlowDocumentScrollViewerAutomationPeer.cs